An ideal way to hang unframed artwork on foam core or corrugated board which is at least 1/4 inch thick. Great for schools and hanging kids artwork at home. Compatible with any of our hooks. They have sharp metal prongs that press into the back of the work, so again it’s important to use them only in situations where that’s not going to damage anything precious. But they do add invisible hanging points and have a specified capacity of 400g with one hanger or 800g with two. Place near the top of the artwork.